Inelastic collisions of positrons with lithium and sodium atoms

Abdel‐Raouf, M. A.

doi:10.1088/0953-4075/21/12/019

Cited by 44 publications

(18 citation statements)

References 11 publications

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“…In Fig. 1 we show the present TCS results together with the distorted wave results of Guha and Mandal (1980) and the coupled static results of Abdel-Raouf (1988) which exhibit a sudden increase at Ei = 5 eV. Our results, however, show a smooth decrease with increasing E i • The present TCS is larger than that of Guha and Mandal (1980) and Abdel-Raouf (1988) for Ei < 20 eV, but above 20 eV the present distorted wave results fall below the results of Abdel-Raouf (1988).…”

Section: Resultsmentioning

confidence: 69%

“…Moreover, they used a Is type wavefunction for the valence electron which is actually a 3s electron. Abdel-Raouf (1988) used the coupled static and frozen core approximation in the incident positron energy range 0 ·1-1000 e V in order to study the process. In the present paper we compute the TCS for Ps formation in the ground state in e+ -Na scattering over the energy range 1-50 eV by using a distorted wave approximation, which unlike the distorted wave formalism of Guha and Mandal (1980), incorporates the effect of polarisation.…”

Section: Introductionmentioning

confidence: 99%

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Positronium Formation in e+ ?Na Scattering

Singh¹,

Choudhury²,

Mazumdar³

et al. 1992

Aust. J. Phys.

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Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Positronium Formation in e+ ?Na Scattering

Singh¹,

Choudhury²,

Mazumdar³

et al. 1992

Aust. J. Phys.

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“…It is related to the energy of the incident proton by: The coupled static approximation states that the solution of the two channel scattering problem under consideration is subjected to the following conditions [14]:…”

Section: Theoretical Formalismmentioning

confidence: 99%

“…V pol H(2s) (σ), which is added to include all pstates of n=2, i.e., H(2s+2p), is defined by (see ref. [14]):…”

Section: Theoretical Formalismmentioning

confidence: 99%

Effect of Polarization Potential on Proton–Sodium Inelastic Scattering

Elkilany

2014

Braz J Phys

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Inelastic collisions of protons with sodium atoms are treated for the first time within the framework of the coupled static and frozen core approximations. The method is used for calculating partial and total cross-sections with the assumption that only two channels (elastic and hydrogen formation in 2s-state) are open. The calculations are carried out, in each case, for seven values of the total angular momentum ℓ (0≤ ℓ ≤6). In the second channel, the effect of "switching on" the polarization potential of hydrogen (in 2s-state) on the coupled static cross-sections is investigated. Although the resulting hydrogen (in 2s-state) formation cross-sections are smaller than the elastic ones, their large values should draw the attention of experimental and theoretical physicists to the field of proton-alkali atom collisions. Our results for the total hydrogen (2s-state) formation cross-sections and those determined by previous authors are in reasonable agreement.

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“…Theoretical investigation on electron-, positron-, and proton-atom scattering has been carried out by many authors. Abdel-Raouf [1] applied the coupledstatic and frozen core approximations to positron-lithium and positron-sodium scattering as a two-channel problem. Elkilany and Abdel-Raouf [2] investigated the effect of polarization potentials on antiprotons scattered by positronium using the coupled static model.…”

Section: Introductionmentioning

confidence: 99%

Formation of ground and excited hydrogen atoms in proton–caesium inelastic scattering

Elkilany

2015

Can. J. Phys.

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The inelastic scattering of a proton with a caesium atom is treated for the first time as a three-channel problem within the framework of the improved coupled static approximation with the assumption that the ground (1s state) and excited (2s state) hydrogen formation channels are open for seven values of the total angular momentum, ℓ ͑0 ≤ ℓ ≤ 6͒ at energies between 50 and 500 keV. The Green's function iterative numerical method is used to obtain the computer code to calculate iterative partial cross sections. This can be done through calculating the reactance matrix at different values of considered energies to obtain the transition matrix that gives partial and total cross sections. Present results give reasonable agreement with previous results. PACS Nos.: 34.80.Dp, 34.80.Gs, 34.80.Ht. Résumé :Pour la première fois, la diffusion inélastique de protons sur des atomes de Cs est traitée comme un problème à trois canaux dans le cadre de l'approximation améliorée du couplage statique sous l'hypothèse que les canaux de formation d'hydrogène dans les états fondamental (état 1s) et excité (état 2s) sont ouverts pour sept valeurs du moment cinétique orbital, ℓ ͑0 ≤ ℓ ≤ 6͒, à des énergies entre 50 et 500 keV. Nous utilisons la méthode numérique itérative pour la fonction de Green afin d'obtenir le code source pour calculer itérativement les sections efficaces partielles. Ceci est fait via le calcul de la matrice de réactance à différentes valeurs d'énergie pour obtenir la matrice de transition qui donne les sections efficaces partielles et totale. Nos résultats sont en accord raisonnable avec des résultats antérieurs. [Traduit par la Rédaction]

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Inelastic collisions of positrons with lithium and sodium atoms

Cited by 44 publications

References 11 publications

Positronium Formation in e+ ?Na Scattering

Positronium Formation in e+ ?Na Scattering

Effect of Polarization Potential on Proton–Sodium Inelastic Scattering

Formation of ground and excited hydrogen atoms in proton–caesium inelastic scattering

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